Problem:

How to calculate the Hydrotest Hoop stress and Allowable in AutoPIPE?

Give the following information:

Piping code = B31.3 - 2014

Ambient temp = 21 deg C

Units = SI

Hydrotest settings:

Solution:

Start by looking at the following AutoPIPE help section:

1. Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> select the proper piping code & year a

2. Select the Hoop Stress section

3. Look for the appropriate equations for Stress and Allowable that AutoPIPE is using. 

From the Pipe properties dialog find values for Do, tred, W, and E

From the Pressure Temp tab on the grids find the respective value for Pressure, Temperature, and SH as defined by the Hydrotest dialog (ex. P4 - T4)

Perform the Calculations

Stress Calculation:

Allowable calculation:: 

= W*E*SH

where

W = 1

E = 1

SH = 137.8951 N/mm^2

Allowable = 137.90 N/mm^2

Compare to allowable documented for hydrotest case:

Note: See WIKI here for method of setting a custom allowable value for the combination.

How to assign code allowable stress for hydrotest loading: hoop stress and HY stress combination in AutoPIPE?

See Also

Bentley AutoPIPE